Make-so node "Tags" panel shows a dropdown showing previously used tags

[Venryx]

• On simply clicking the input, the dropdown should show the most-used tags throughout the database.
• When user starts typing, that list should be filtered to only the tags containing the typed text. (filtered list still ordered from most-usages to least-usages)
• Each tag should have a number shown at their right saying how many nodes have the given tag applied.
• In order to know how many nodes have a given tag, there should be an index in the database (or some sort of other database tracking), so the numbers can be retrieved efficiently.